<template>
  <div>
    <el-radio-group v-model="isCollapse" style="margin-bottom: 20px;">
      <el-radio-button :label="false"><i class="el-icon-s-unfold"></i></el-radio-button>
      <el-radio-button :label="true"> <i class="el-icon-s-fold"></i></el-radio-button>
    </el-radio-group>
<el-menu 
  default-active="1-4-1" 
  class="el-menu-vertical-demo" 
  :collapse="isCollapse"
>
  <el-submenu index="1">
    <template slot="title">
      <i class="el-icon-location"></i>
      <span slot="title">导航一</span>
    </template>
    <el-menu-item-group>
      <span slot="title">分组一</span>
      <el-menu-item index="1-1">选项1</el-menu-item>
      <el-menu-item index="1-2">选项2</el-menu-item>
    </el-menu-item-group>
    <el-menu-item-group title="分组2">
      <el-menu-item index="1-3">选项3</el-menu-item>
    </el-menu-item-group>
    <el-submenu index="1-4">
      <span slot="title">选项4</span>
      <el-menu-item index="1-4-1">选项1</el-menu-item>
    </el-submenu>
  </el-submenu>
  <el-menu-item index="2">
    <i class="el-icon-menu"></i>
    <span slot="title">导航二</span>
  </el-menu-item>
  <el-menu-item index="3" disabled>
    <i class="el-icon-document"></i>
    <span slot="title">导航三</span>
  </el-menu-item>
  <el-menu-item index="4">
    <i class="el-icon-setting"></i>
    <span slot="title">导航四</span>
  </el-menu-item>
</el-menu>
  </div>
</template>

<script>
export default {
    data() {
      return {
        isCollapse: true,
        isArr:false
      };
    },
  
}
</script>

<style lang="less" scoped>
 .el-menu-vertical-demo:not(.el-container--collapse) {
    width: 200px;
    min-height: 400px;
    background-color:#000;
    color: goldenrod;
 }
</style>